621394420 has 48 divisors (see below), whose sum is σ = 1323721728. Its totient is φ = 245001600.

The previous prime is 621394409. The next prime is 621394429. The reversal of 621394420 is 24493126.

It is a happy number.

621394420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×621394420² = 772262050414272800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621394429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 571117 + ... + 572203.

It is an arithmetic number, because the mean of its divisors is an integer number (27577536).

Almost surely, 2^621394420 is an apocalyptic number.

It is an amenable number.

621394420 is an abundant number, since it is smaller than the sum of its proper divisors (702327308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621394420 is a wasteful number, since it uses less digits than its factorization.

621394420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480 (or 1478 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 621394420 is about 24927.7840972679. The cubic root of 621394420 is about 853.3406802075.

The spelling of 621394420 in words is "six hundred twenty-one million, three hundred ninety-four thousand, four hundred twenty".